Combined hand drill and valve grinder



M 114 1924, A DQM 11,111,663

COMBINED HAND DRILL AND-VALVE GRINDER Filed March ,-192s 2 Sheets-Sheet. 1

A. DOM

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ArraeA/EY' Patented ct. 1 i, F92 5.

ALEXANDER DOM, F CINCINNATI, OHIO.

Application filecllVIarch 13, 1923. Serial No. 624,848.

To all whom it concern a I 7 Be it known that I, ALEXANDER DOM, a citizen. of the United States, residing at Gincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Combined Hand Drills and Valve Grinders, of which the following is a specification.

My invention relates to combination hand drills and valve grinders.

The objects of my invention are to provide a simple, efficient, convenient, economical and easily operated tool which may be used either as a hand drill or as a valve grinder as occasion requires. As a drilling machine it operates as any other drilling machine, running forward continuously but when adjusted for valve grinding the motion transmitted to the grinding tool is about two turns forward to one reverse with the continuous forward motion of the operating handle.

My invention consists in a frame in which is mounted a shaft carrying two gears loosely mounted and two clutches keyed thereon and slidably mounted and adapted to be shifted into and out of engagement with said gears by a shifting plate, said gears being operated by a large ring gear within which is mounted an adjustable track which in its inner or contracted adjustment forms a circular grooved track which holds the shifting mechanism in continuous forward action and when adjusted for alternating reversible motion, such as valve grinding, the form of the grooved track is oblong with a curve at each end and forms acam or its equivalent, causing the mechanism to oscillate from the forward driving gear to the reverse driving gear alternately, the shifting mechanism being so constructed that the forward motion has practically twice the motion of the reverse motion.

My invention also consists in the parts and in the combination and arrangement of parts as herein set forth and claimed.

In the drawings:

Fig. 1 is a rear elevation of the device;

Fig. 2 is an inner face view of the ring gear and slidable sector carried thereby forming part of my invention;

Fig. 3 is a plan view and side elevation of the clutch shifter;

Fig. 1 is a front. elevation of the device after the ring gear has been removed;

Fig. 5 is a side elevation of the device;

Fig. 6 is a front elevation of the device;

Fig.7 is a longitudinal section of the de vice;

Fig. 8 is a front elevation of the device showing it in position for use in grinding valves on an automobile;

Fig. 9 is a perspective view of the slidable sector mounted in the ring gear;

Fig. 10 is an inner face view of the ring gear indicated by dotted lines with the adjusted sector adjusted to form a circular track for use in drilling; and

Fig. 11 is a similar view with the adjustable sector in extended position to form an oblong track whereby an alternately reversible motion is obtained for valve grinding and the like.

In the embodiment of my invention as illustrated and which shows a preferred construction the frame 1 comprises spaced apart sides 2 and 3 which are connected at one end to tubular bearing t and at the other end to tubular bearing 5 on which handle 6 is mounted. Said sides 2 and 3 are centrally connected by cross support 7 having tubular v opening 8 extending transversely therethrough in alinement with bearings 4 and 5 and having upon one side a boss 9 with flat.- tened sides 10 and 11. A hollow internally threaded stud 12 extends outwardly from said boss.

The operating shaft 13 is rotatably mounted in frame 1 in hollow bearings a and 5 and preferably projects beyond bearing 41 for the purpose of attaching a chuck let or other tool. Clutch gear 15 is rotatably mounted upon said shaft adjacent bearing 1 and a like clutch gear 16 is rotatably mounted on said shaft adjacent bearing 5 both within said frame. Each of said gears is so mounted on said shaft as to allow a minimum of longi tudinal movement. Clutches 17 and 18 are each slidably and non-rotatably mounted on shaft 13 between its respective clutch gear and cross support 7. j i

The clutch shifter 19, preferably of the form shown in Fig. 3, is slidably mounted on said frame, spanning boss 9 and having fingers 2O slidably engaging grooves 21 in clutches 17 and 18. Said clutch shifter is of such length that when moved longitudinally to bring one of the clutches out of operative engagement with its clutch gear it will bring the other clutch into operative engagement with the other clutch gear. Pin 22. preferably of small diameter, is fixed on the face of clutch shifter 19 and is preferably provided with an anti-friction'roller .23.

- Ringgear24; is mounted on boss 9 and stud 12 which latter extends through central bear,-

ing 25, said ring gear being in operative engagement with said clutch gears. The inner face of ring gear 24 is provided with recess 26 of peculiar shape and having curved and straight surfaces and so formed that adjustable sector 27, clearly shown in Fig. 9, mount-ed therein forms a oircular'bearing or Y 1 track 28 when adjusted to contracted position and forms oblong hearing or tracik 29 when adjusted to its extended position. Said sector 1s provided wlth an arc-shaped memiber 80 having flat faces and .32 to :slidably iengage corresponding flat faces .33 and 34 respcotively, formed on the wall .ofsaid recess. A .U-shaped cam 85 is Supported by said areshaped member in spaced apart relation therewith and spans boss .36 centrally formed in ring gear 24. Thumb screw 37 extending through slot 38 is mounted in sector 27 for the purposeo-f holding said sector either contracted .or expanded position. The ring gear is held in assembled relation with the other parts of the device by means of screw f39-secured in the -end- 0f stud 12. A suitable operating handle 4:0 is fixed upon ring gear 2% and preferably extends beyond the periphery thereof. I When it is desired to operate the device aska hand drill the sector is adjusted to the position shown by dotted lines in Fig. 2 or to the position shown by full lines in Fig. 10 thereby forming a circular track and cansing'the oper-atingshaft to move continuously injone direct-ion only. ,W hen it is desired to adjust the device to obtain-am alternating reversible motion of the shaft, as in valve grinding, merely loosen screw 39 and adjust the sector to the position shown by-full lines in Figs. 2 and 11 and again tighten the thumb screw thereby forming an oblong track bringing cam "35 into operative position whereby an alternating reversible motion 1s produced.

1 When in its contracted position the roller '23 travels in the circular groove as indicated by ,dotted'lines in .Fig. 1-0, and causes no oscillationof clutch shifter 19 but in its expanded or extended position roller 23 travels in the oblong groove in the .path'indica-ted by dotted lines in Fig. 11 andosc-illates sai-d clutch shifter 19 thereby carrying clutches I17 and 18. into and out of engagement alter v nately with the two clutch gears thereby in termittent-ly reversing the motlo-n of the I sary' for satisfactory valve to operating tool which is essential and necesgrinding. In grinding valveswith this tool it is held in engagement with-the valve by one hand (see Fig. 8) andby turning handle 40 in one direction only with the other hand a, uniform forward-and reverse movement of the valve onitsfseat is obtained, approximately two turns forward to one reverse to each -revolution of the handle 40.

Valves were first ground by holding a screw driver in vertical position between the hands and rotating it several times forward .and backward and then, after taking a new hold, repeating the operation, suggestingthe desirability of motion obtaining the alternating reversible motion of different proportions for the purpose of avoiding grooving of the valve seats and to secure a perfectly smooth air or gas tight seat. I accomplish this result mechanically and secure uniformity of action in the operation by means of my construction.

An advantage of my invention is in providing a tool that will do this work perfectly in combination with an original standard equipped hand drill thereby greatly .eeonomizi-ng in the cost of the tool for both purposes.

While I have shown anddescribed a particular construction and arrangement of parts it will :be apparent that various modifications may be made without departing from its scope or spirit as defined in the claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a combined hand drill and valve grinder, a frame, a shaft rotatably mounted in said frame, clutch gears each rotatably mounted on said shaft, clutches each slidably and non-rotatably mounted on said shaft and adapted to engage or disengage its adjacent clutch gear, a clutch shifter engaging said clutches, operating means on said clutch shifter, a ring gear provided with suitable opera-ting means and mounted in engagement with said clutch gears and having means therein to form either a circular or an oblong track, as desired, to engage said opera-ting means whereby when said ring gear is turned continuously in one direction said shaft will be driven continuously in one direction also when said track is adjusted to circular form, but will have an alternating reversible motion when said track is extended to oblong form.

2. In a combined hand drill and valve grinder, a frame, a shaft rotatably mounted in said frame, clutch gears each rotatably mounted on said shaft, clutches each slidably and non-rotatably mounted on said shaft and adapted to engage or disengage its adjacent clutch gear, a clutch shifter engaging said clutches, a pin or roller on said clutch shifter, a ring gear provided with suitable operating means and mounted in engagement with said clutch gears and having means therein to form either a cirously in one direction also when said track 1 ,51 1 ,sea .t

is adjusted to circular form, but will have an alternating reversible motion when said track is extended to oblong form.

3. In a combined hand drill and valve grinder, a frame, a shaft rotatably mounted in said frame, clutch gears each rotatably mounted on said shaft, clutches each'slidably and non-rotatably mounted on said shaft and adapted to engage or disengage,

its adjacent clutch gear, a clutch shifter engaging said clutches, operating means on said clutch shifter, a ring gear mounted in engagement with said clutch gears and having a recess therein provided with straight walls and curved walls, an adjustable sector having curved walls and straight walls and means to hold said sector in adjusted posi tion to form either a circular track or an elongated track having curved ends to engage said operating means whereby when said ring gear is turned continuously in one direction said shaft will bedriven continuously in one direction also when said sector is in contracted position, but will have an alternating reversible motion when said sector is adjusted to elongated or extended position.

4. In a combined hand drill and valve grinder, a frame having bearmgs, a handle on said frame, a rotatable shaft in said bearings, clutch gears each rotatably mounted on said shaft, clutches each slidably and non-rotatably mounted on said shaft and adapted to engage or disengage its adjacent clutch gear, a clutch shifter engaging said clutches, operating means on said clutch shifter, a ring gear provided with suitable operating means and mounted in engage ment with said clutch gears and having means therein to form either a circular track or an oblong track, as desired, to engage said operating means whereby when said ring gear is turned continuously in one direction said shaft will be driven continuously in one direction also when said track is adjusted to circular form, but will have an alternating reversible motion when said track is extended to oblong form.

5. In a combined hand drill and valve grinder, a frame having a bearing at'each end, a cross support centrally of said frame and having a tubular opening extending transversely therethrough, a shaft rotatably mounted in said bearings, clutch gears each rotatably mounted on said shaft, clutches each slidably and non-rotatablymounted on said shaft and adapted to engage or disengage its adjacent clutch gear, a clutch shifter engaging said clutches, operating means on said clutch shifter, a ring gear provided with suitable operating means and mounted in engagement with said clutch;

gears and having means therein to form e1ther a circular track or an oblong track, as desired, to engage said operating means whereby when said ring gear is turned continuously in one direction said shaft will be driven continuously in one direction also when said track is adjusted to circular form, but will have an alternating reversible motion when said track is extended to oblong form.

6. In a combined hand drill and valve grinder, a frame having a central bearing and a bearing at each end, a handle on said frame, a shaft rotatably mounted in said bearings, clutch gears each rotatably mounted on said shaft, clutches each slidably and non-rotatably mounted on said shaft and adapted to engage or disengage its adjacent clutch gear, a clutch. shifter engaging said clutches and comprising a slotted plate having means at each end adapted to engage said clutches, operating means on said clutch shifter, a ring gear provided with suitable operatingmeans and mounted in engagement with said clutch gears and having means to form either a circular track or an oblong track, as desired, to engage said operating means whereby when said ring gear is turned continuously in one direction said shaft will be driven continuously in one direction also when said track is adjusted to circular form, but will have an alternating reversible motion when said track is extended to oblong form. t j i 7. In a combined hand drill and valve grinder, a frame comprising spaced apart sides connected at one end to a hollow stem and at the other end to a tubular bearing and having a cross support centrally connecting said sides with a tubular opening extending transversely therethrough, a stud mounted on said support, a rotatably mounted shaft in said bearings, clutch gears each rotatably mounted on said shaft, clutches each slidably and non-rotatably mounted on said shaft and adapted to engage or disengage its adjacent clutch gear, a clutch shifter engaging said clutches, operating means on said clutch shifter, a ring gear provided with suitable operating means and mounted on said stud in engagement with said clutch gears and having means therein to form either a circular track or an oblong track, as desired, to engage said operating means whereby when said ring gear is turned continuously in one direction said shaft will be driven continuously in one direction also when said track is adjusted to circular form, but will have an alternating reversible motion when said track is extended to oblong form. i

8. In a combined hand drill and valve grinder, a frame, a shaft rotatably mounted in said frame, clutch gears each rotatably mounted on said shaft, clutches each slidably and non-rotatably mounted on said shaft and adapted to engage or disengage said clutch gear, a clutch shifter engaging shifter, a ring gear said clutches, operating means on said clutch mounted in engagement With said clutch gears and havinga recess in its inner face, a sector having a .caurand mounted in said recess and adapted to Abe ad? justed to contracted position to fora-n .a cir-- cular bearing or track engaged by saidloweratingrnea lis to produce 'continuoiuslronary motion of said shaft or to. be extended to oblong position :to form an ole-long bear: ing .or track to. produce an alternating reversible motion (of said shaft, and means for operating said'ring gearcontinuously in one direction.

' said rfraine,

' adapted "9. In a combined hand drill valve grinder, a frame,

a 'rotatably' mounted shaft and hon-rotatably :niounted on-said shaft and adapted to! engage or disengage its ad across support on said jaeentfrcl utoh gear,

frame, a boss on said support, a stud on said boss, a clutch sh itter spanning said boss and adapted to move said clutches into and out ofgoperative engagement, respectiuely, ,opcrating means 011.,said-shifter, a ring gear provided with suitably operating'means and mounted on' saidstud in -,engagveinent with said clutch gears having means therein to form either a circular track or oblong track, as desired, to engage said operating means 'Whereby When-said ring gear is turned continuously in one direction said shaft be driven continuously in one direction also when said track is adjusted to circular form but Will have an valternating reversible Elk-0r tionavhen'salid track is extended to oblong rnig gear 1n forna and means to hold said .16. In alcombined grinder, a frame, a shaft in said frame, clutchgears each rotatalblymounted von saidshafit, clutches slidaibly and non-rot-atalhly mounted .on said shaft, and toengage or disengage its lijacent rotatably mounted clutch gear, .a clutch shifter slidably engaging said ehrtch, operating means clutch shifter, a ring" gear provided with suitable operating means and mounted in engagement with said clutch gears-and having means therein to form; either a circular track or an oblong track, as desired to engage saichoperating means whereby when said: ring gear is turned continuously ilIIJQIlG ouslyin .one direction also when said-track .1'.s.'adj.usted to circulat -forms, lbut ,Willhaye i101;

clutch gears each rotatably mounted on saidsha-ft,.clutcheseach sli-dably gr nder,

on said ring gear'provided with suitable operating means and. mounted in engagement with said'cl-utch gears and having means therein toitorm e ther a circular track or an oblong tr clslas desired, to engage said operating means whereby, when "said ring gear is t nned. continuously in one direction saidshaft will be driven continuously in one .direction also hen said track is adjusted to circular form, but will have an alternating reversible motion 'when said track is extended tooblong form. v j 12.'In a combined hand drill and valve grinder, a frame-a shaft rjota tabiy mounted in said iralne, clutch gears each rotatably mounted on said shaft, clutches each slidaand non-rotatably mounted onsaid shaft and adapted to engage ,or disengage its adjacent chrtch gear, a clutch shifter having fingers adapted to engage. said clutches, operating n i'eans' on said clutch shifter, a ,linggear-provided with suitable operating means and mounted in engagement with said clutch gears and having means therein to form-either a circular track or an oblong track, nsdesired, to engage saidoperating 11163118 whereby when said ri g geari-s turned Continuously in- ,one direc ion sa d sh t ill be driven n inuously in one direction also when said track is adjusted to circulargforna but will hare alternating reversible motion when said track; is extendedto oblong-form. I

13; In a combin d hand. dr-illand valve a frame, a shaft rotatably mounted in said frame, clutch gears each rotatably mounted on said shaft and adapted to en gage or disengage said clutches, a clutch liitt re g g ng-sa d clut h enera i s me ns on said l h shif -9 a ring g r mounted in engagengient,v with said clutch gears and havinga recess inits inner face, a, sector having acam, and mounted in said recess and adapted ,to be adjusted to contracted position to form acircular hearing or track to; produce a continuous rotary motion of said shaft or to be adjusted to extended position to form an .oblo hearing or track engaged by said operating means ALEXANDERDOM- 

